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You received a notice from California Air Resources Board (CARB) directing your vehicle for CARBTest testing. The vehicle must be inspected by CARBTest within the period specified in the CARB’s notice.

Your vehicle has recently had an engine change and needs the CARBTest’s verification of the engine change for compliance with the California Clean Truck Check program. An "engine change" is the installation of an engine in a vehicle that is different from the vehicle manufacturer original configuration as certified by the United States Environmental Protection Agency (U.S. EPA) or California Air Resources Board (CARB).

Your vehicle has recently had an alternative fuel system retrofit and needs CARBTest’s verification of the fuel system retrofit for compliance with the Clean Truck Check program. “Alternative fuel retrofit system” or “retrofit system” is a package of fuel storage and delivery, ignition, emission control, on board diagnostic, and engine components that are modified, removed, or added during the process of modifying a motor vehicle or engine to operate on an alternative fuel.

Your vehicle has been recently converted to a motor home and needs the CARBTest’s verification of the conversion for compliance with the California Clean Truck Check program. “Motor home” means a vehicle that is designed exclusively for human habitat for recreational or emergency occupancy.

To request a compliance time extension for your vehicle because the part(s) needed for the repair(s) to pass the California Clean Truck Check program compliance test by the vehicle’s compliance deadline is/are unavailable.

You have a dispute over your vehicle’s inspection test result and want to request an independent evaluation of your vehicle’s compliance test.

There are no available credentialed testers to perform your vehicle’s compliance test and you would like to request CARBTest to perform the vehicle’s required compliance test.

Your vehicle’s condition makes it incompatible with CARB Clean Truck Check test procedures due to unusual vehicle configurations, design, or other inspection incompatibility.

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